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Old 01-08-2013, 10:38 AM   #1769
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Member#: 124282
Join Date: Aug 2006
Chapter/Region: NWIC
Location: 30000 ft
04 WRX Wagon PSM
13 STI Sedan SWP


Originally Posted by Equilibrium Tuning View Post
Theoretically you should be able to calculate the needed trim based on IAT by calculating the resulting variance in air density. I always thought IAT should be worked into a true speed density calculation. But in practice it doesn't seem that simple or consistent.

-- Ed
Almost by definition, an SD calculation has to use IAT (charge temp). PV = nRT. Nothing theoretical about it.

Do note, however, that most standalones aren't using a true SD or VE style fueling calculation, which calculates air mass available then fuel mass needed then injector on time. It's a more simple injector on time system, but still requires an air temp. compensation.
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